每日钉一下（时间最宝贵，如何做好分配呢？）

Group 1 - The article highlights that most investors are familiar with stock index funds but have limited knowledge about bond index funds, indicating a gap in understanding investment options [1] - It introduces a free limited-time course that focuses on investment methods for bond index funds, suggesting an educational opportunity for investors [1] - The article encourages readers to engage with a course assistant to receive additional resources such as course notes and mind maps for efficient learning [2]